Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net sales	$ 718.3	$ 596.4	$ 2,023.3	$ 1,683.4
Operating costs and expenses:
Cost of sales	479.3	442.6	1,420.1	1,301.2
Depreciation and amortization	31.1	29.6	91.3	86.0
Selling and administrative	49.2	47.0	144.8	135.8
(Gain) loss on sale or impairment of long-lived assets, net	0.7	0.3	(1.8)	1.0
Other operating credits and charges, net	(0.9)	0.0	4.5	11.4
Total operating costs and expenses	559.4	519.5	1,658.9	1,535.4
Income from operations	158.9	76.9	364.4	148.0
Non-operating income (expense):
Interest expense, net of capitalized interest	(4.9)	(9.0)	(14.8)	(26.3)
Investment income	2.9	2.5	7.2	6.4
Loss on early debt extinguishment	0.0	(13.2)	0.0	(13.2)
Other non-operating items	(0.6)	(0.5)	(2.4)	1.4
Total non-operating income (expense)	(2.6)	(20.2)	(10.0)	(31.7)
Income from continuing operations before taxes and equity in income of unconsolidated affiliates	156.3	56.7	354.4	116.3
Provision (benefit) for income taxes	46.4	(7.5)	97.9	13.1
Equity in income of unconsolidated affiliates	(1.0)	(1.4)	(3.8)	(4.4)
Income from continuing operations	110.9	65.6	260.3	107.6
Loss from discontinued operations before tax	(1.7)	0.0	(1.7)	0.0
Benefit for income taxes	(0.6)	0.0	(0.6)	0.0
Loss from discontinued operations	(1.1)	0.0	(1.1)	0.0
Net income	$ 109.8	$ 65.6	$ 259.2	$ 107.6
Basic net income per share of common stock:
Income per share continuing operations	$ 0.77	$ 0.46	$ 1.80	$ 0.75
Loss per share discontinued operations	(0.01)	0.0	(0.01)	0.0
Net income per share	0.76	0.46	1.79	0.75
Diluted net income per share of common stock
Income per share continuing operations	0.76	0.45	1.78	0.74
Loss per share discontinued operations	(0.01)	0.00	(0.01)	0.00
Net income per share	$ 0.75	$ 0.45	$ 1.77	$ 0.74
Weighted average shares of stock outstanding - basic	144.5	143.7	144.4	143.3
Weighted average shares of stock outstanding - diluted	146.5	145.4	146.3	145.2